The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking to procure six units of a specialized antenna coupler, identified by NSN 7R-5985-015855349-P8 and reference number 822-1706-002. This procurement requires engineering source approval due to the critical nature of the item, necessitating that only approved sources may submit proposals, as the item is flight critical and the technical data available does not support full and open competition. Interested vendors must provide comprehensive documentation as outlined in the NAVSUP Source Approval Information Brochures, and proposals must be submitted within 45 days of this presolicitation notice. For further inquiries, potential bidders can contact Danielle Diciacco at (215) 697-5970 or via email at danielle.diciacco.civ@us.navy.mil.